Structure for connecting flexible flat cables

ABSTRACT

A trunk cable 12 includes a signal trunk conductor 31 that is electromagnetically shielded by a shield layer 35. A branch cable 13 includes a signal branch conductor 38 that is electromagnetically shielded by a shield layer 42. The signal trunk conductor 31 and the signal branch conductor 38 are electrically connected to each other by a relay bus bar 64 that is electromagnetically shielded by a base shielding member 65 and a cover shielding member 27.

TECHNICAL FIELD

Technology disclosed in this specification relates to a structure forconnecting a plurality of flexible flat cables.

BACKGROUND

Conventionally known is a flexible flat cable that has a conductive pathand a flexible insulating layer enclosing the conductive path. Becausethis flexible flat cable has flexibility, it is possible to suitably usethe flexible flat cable if wiring is required in a limited space such asin a vehicle, for example.

The technology disclosed in Japanese Patent Laid-Open Publication No.2003-168508 is known as technology for connecting a plurality offlexible flat cables. According to this technology, a conductive path ofa lower flexible flat cable and a conductive path of an upper flexibleflat cable are electrically connected to each other by a connectionmember by inserting the connection member in a state in which aplurality of flexible flat cables to be connected to each other arevertically placed on each other.

PRIOR ART DOCUMENT Patent Document

Patent Document 1: JP 2003-168508A

SUMMARY OF THE INVENTION Problems to be Solved

If a conductive path of a flexible flat cable needs to beelectromagnetically shielded, it is conceivable to provide a conductiveshield layer for further enclosing an insulating layer enclosing theconductive path. When flexible flat cables that have such a shieldingstructure are to be connected to each other, if a method is adopted inwhich a connection member is inserted in a state in which a plurality offlexible flat cables are vertically placed on each other as inconventional technology, an issue arises that the connection membercannot be electromagnetically shielded because the connection member isnot enclosed by the shield layer.

Technology disclosed in this specification has been made based on theabove-described circumstances, and aims to provide a structure forconnecting a plurality of flexible flat cables that includeelectromagnetically shielded conductive paths.

Means to Solve the Problem

A structure for connecting flexible flat cables according to technologydisclosed in this specification includes a flexible flat trunk cable,which includes a signal trunk conductor; a ground trunk conductor; atrunk shield that is electrically connected to the ground trunkconductor and encloses the signal trunk conductor to magnetically shieldthe signal trunk conductor; and an insulating trunk coating for coveringthe signal trunk conductor, the ground trunk conductor, and the trunkshield, and a flexible flat branch cable, which includes a signal branchconductor; a ground branch conductor; a branch shield that iselectrically connected to the ground branch conductor and encloses thesignal branch conductor to electromagnetically shield the signal branchconductor; and an insulating branch coating for covering the signalbranch conductor, the ground branch conductor, and the branch shield, arelay bus bar that includes a trunk-side terminal portion connected tothe signal trunk conductor, and a branch-side terminal portion connectedto the signal branch conductor; and a shielding member for enclosing therelay bus bar to electromagnetically shield the relay bus bar.

According to the above-described configuration, it is possible toelectromagnetically shield the relay bus bar by the shielding member.Accordingly, it is possible to connect the signal trunk conductor of theflexible flat trunk cable and the signal branch conductor of theflexible flat branch cable in a state in which the relay bus bar iselectromagnetically shielded.

Embodiments of the technology disclosed in this specification preferablyhave the following features.

It is preferable that the shielding member includes a trunk-side groundterminal portion connected to the ground trunk conductor, and abranch-side ground terminal portion connected to the ground branchconductor.

According to the above-described configuration, it is possible toimprove shield performance of the relay bus bar because the shieldingmember is connected to the ground trunk conductor and the ground branchconductor.

It is preferable that the shielding member includes a base shieldingmember that includes the trunk-side ground terminal portion and thebranch-side ground terminal portion, and a cover shielding member forenclosing the relay bus bar between the base shielding member and thecover shielding member.

According to the above-described configuration, it is possible to easilyshield the relay bus bar by connecting the base shielding member to theground trunk conductor and the ground branch conductor, and to arrangingthe relay bus bar between the base shielding member and the covershielding member.

According to this embodiment, it is preferable that the base shieldingmember and the cover shielding member are electrically connected to eachother.

According to the above-described configuration, it is possible toelectrically connect the ground trunk conductor, the ground branchconductor, the base shielding member, and the cover shielding member,and thus to reliably shield the relay bus bar.

It is preferable that an insulating cover made of an insulatingsynthetic resin is interposed between the relay bus bar and the covershielding member.

According to the above-described configuration, it is possible toinhibit short circuits between the relay bus bar and the cover shieldingmember.

Effect of the Invention

According to the technology disclosed in this specification, it ispossible to connect a plurality of flexible flat cables havingelectromagnetically shielded conductive paths.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a perspective view showing a branch box according toEmbodiment 1.

FIG. 2 is an exploded perspective view showing the branch box.

FIG. 3 is a plan view showing the branch box from which a cover isdetached.

FIG. 4 is a cross-sectional view of the branch box taken along lineIV-IV in FIG. 3.

FIG. 5 is a perspective view showing a process for attaching a covershielding member to the cover.

FIG. 6 is a schematic cross-sectional view showing a structure of aregion of a trunk cable in which power trunk conductors are arranged.

FIG. 7 is a schematic cross-sectional view showing a structure of aregion of the trunk cable in which signal trunk conductors and groundtrunk conductors are arranged.

FIG. 8 is a schematic cross-sectional view showing a structure of aregion of a branch cable in which power branch conductors are arranged.

FIG. 9 is a schematic cross-sectional view showing a structure of aregion of the branch cable in which signal branch conductors and groundbranch conductors are arranged.

FIG. 10 is an exploded perspective view showing a conductive relay path,an insulating plate, and a base shielding member.

FIG. 11 is a perspective view showing a shielding structure of a relaybus bar, omitting the insulating plate.

FIG. 12 is a perspective view showing a process for arranging a trunkcable and a branch cable on a case.

FIG. 13 is a perspective view showing a state in which the trunk cableand the branch cable are arranged and positioned in the case and.

FIG. 14 is a perspective view showing a process for attaching aconductive relay path to the trunk cable and the branch cable.

FIG. 15 is a perspective view showing a process for attaching a cover tothe case on which the trunk cable, the branch cable, and the conductiverelay path are mounted.

FIG. 16 is a plan view showing a state in which the trunk cable, thebranch cable, and the conductive relay path are mounted on the case.

FIG. 17 is a perspective view showing a process for mounting fuses on afuse mounting portion.

FIG. 18 is a perspective view showing a branch box according toEmbodiment 2.

FIG. 19 is a perspective view showing the branch box.

FIG. 20 is a plan view showing the branch box in a state in which atrunk subcover and a branch subcover are opened.

FIG. 21 is a perspective view showing a process for attaching a covershielding member to the cover.

FIG. 22 is a perspective view showing a process for attaching aconductive relay path to the cover.

FIG. 23 is a perspective view showing a process for attaching aninsulating plate to the cover.

FIG. 24 is a perspective view showing a process for attaching a baseshielding member to the cover.

FIG. 25 is a perspective view showing a process for assembling the coverand the case on which the trunk cable and the branch cable are mounted.

FIG. 26 is a perspective view showing conductive relay path, a covershielding member, an insulating cover, and a base shielding memberaccording to Embodiment 3.

FIG. 27 is an exploded perspective view showing the conductive relaypath, the cover shielding member, the insulating cover, an insulatingplate, and the base shielding member.

FIG. 28 is a cross-sectional view taken along a plane that is parallelto the plane X-Z and passes through legs in FIG. 26.

FIG. 29 is a perspective view showing a conductive relay path, a covershielding member, an insulating cover, and a base shielding member thatare attached to the insulating plate.

FIG. 30 is a perspective view showing a conductive relay path, a covershielding member, an insulating cover, an insulating plate, and a baseshielding member according to Embodiment 4.

FIG. 31 is an exploded perspective view showing a conductive relay path,a cover shielding member, an insulating cover, an insulating plate, anda base shielding member according to Embodiment 5.

FIG. 32 is a perspective view showing a state in which a conductiverelay path, a cover shielding member, an insulating cover, and a baseshielding member according to Embodiment 6 are formed through insertmolding.

FIG. 33 is a cross-sectional view taken along a plane that is parallelto the plane Y-Z and passes through a relay bus bar in FIG. 32.

DETAILED DESCRIPTION TO EXECUTE THE INVENTION Embodiment 1

Embodiment 1 of technology disclosed in this specification will bedescribed with reference to FIGS. 1 to 17. A branch box 10 according tothis embodiment includes a case 11, a trunk cable 12 (an example of aflexible flat trunk cable) fixed to the case 11, a branch cable 13 (anexample of a flexible flat branch cable) fixed to the case 11, aconductive relay path 14 for electrically connecting the trunk cable 12and the branch cable 13, and a cover 15 mounted on the case 11. Thebranch box 10 is installed in a vehicle (not shown) such as an electriccar or a hybrid automobile, for example, and branches a power circuitand a signal circuit. In the following description, “upper” refers tothe Z-direction, “front” refers to the Y-direction, and “left” refers tothe X-direction. Note that, with regard to a plurality of the samemembers, only some of the same members may be given reference numerals,and the other members may not be given reference numerals.

Branch Box 10

As shown in FIG. 1, the branch box 10 is substantially T-shaped overall,when viewed from above. A rear portion of the branch box 10 has arectangular shape that is elongated in the right-left direction, whenviewed from above. A front portion of the branch box 10 extends forwardfrom the vicinity of the center, with respect to the right-leftdirection, of the rear portion of the branch box 10, and has arectangular shape, when viewed from above. A trunk cable 12 is led outto the left and to the right from a left end portion and a right endportion of the branch box 10. The branch cable 13 is led out forwardfrom a front end portion of the branch box 10.

The branch box 10 has a case 11 that is open upward, and a cover 15mounted on the case 11 from above. The cover 15 is slightly larger thanthe outer shape of the case 11. The case 11 has a bottom wall 11A andside walls that extend upward from side edges of the bottom wall 11A.The cover 15 has an upper wall and side walls that extend downward fromside edges of the upper wall. The case 11 and the cover 15 are assembledinto a single body through elastic engagement between locking portions16 protruding from outer surfaces of the side walls of the case 11 andlocking reception portions 17 provided on the side walls of the cover15.

Case 11

As shown in FIG. 3, on the bottom wall 11A of the case 11, twopositioning pins 18A are arranged side-by-side and are spaced apart fromeach other in the right-left direction at positions closer to the rightend portion and protrude upward from the bottom wall 11A, and onepositioning pin 18A protrudes upward at a position closer to its leftend portion. When these positioning pins 18A are inserted into thepositioning holes 19A passing through the trunk cable 12, the trunkcable 12 is positioned relative to the case 11. The positioning holes19A formed in the trunk cable 12 are formed at positions of the trunkcable 12 that are different from the positions of power trunk conductors30, signal trunk conductors 31, and ground trunk conductors 32, whichwill be described later.

Also, on the bottom wall 11A of the case 11, two positioning pins 18Bare arranged side-by-side and are spaced apart from each other in thefront-rear direction at positions closer to its front end portion, andprotrude upward. When these positioning pins 18B are inserted intopositioning holes 19B passing through the branch cable 13, the branchcable 13 is positioned relative to the case 11. The positioning holes19B formed in the branch cable 13 are formed at positions of the branchcable 13 that are different from the positions of power branchconductors 37, and signal branch conductors 38, and ground branchconductors 39, which will be described later.

The left end portion of the case 11 is not provided with a side wall,and is open to the left. Also, the right end portion of the case 11 isnot provided with a side wall, and is open to the right. Accordingly,the trunk cable 12 is led out to the left and to the right from the case11.

The left end portion of the case 11 is provided with a left holdingportion 20A (an example of a holding portion) for holding the trunkcable 12 between the left holding portion 20A and the bottom wall 11A,the left holding portion 20A and the case 11 being formed as a singlebody via a hinge 21. A locking claw 22 is formed at a leading end of theleft holding portion 20A. When the locking claw 22 is locked to a lockedportion 23 provided on a side of the case 11 located opposite to thehinge 21, the trunk cable 12 is held between the bottom wall 11A and theleft holding portion 20A. A plurality (three in this embodiment) ofholding ribs 24 are formed on the side of the left holding portion 20Athat faces the trunk cable 12 in a state in which the locking claw 22and the locked portion 23 are locked to each other, the holding ribs 24extending along the front-rear direction and being arranged side-by-sideand being spaced apart from each other in the right-left direction. Whenthe holding ribs 24 come into contact with the trunk cable 12 fromabove, the trunk cable 12 is reliably held between them.

The right end portion of the case 11 is provided with a right holdingportion 20B (an example of a holding portion) for holding the trunkcable 12 between the right holding portion 20B and the bottom wall 11A,the right holding portion 20B and the case 11 being formed as a singlebody via a hinge 21. Because the constituent elements of the rightholding portion 20B are the same as those of the left holding portion20A, the same constituent elements are given the same referencenumerals, and their redundant description is omitted.

The front end portion of the case 11 is provided with a branch holdingportion 20C (an example of a holding portion) for holding the branchcable 13 between the branch holding portion 20C and the bottom wall 11A,the branch holding portion 20C and the case 11 being formed as a singlebody via a hinge 21. Because the constituent elements of the branchholding portion 20C are the same as those of the left holding portion20A, the same constituent elements are given the same referencenumerals, and their redundant description is omitted.

Cover 15

As shown in FIG. 1, the upper wall of the cover 15 is provided with afuse mounting portion 25 that is open upward, at a position located inthe vicinity of the center in the right-left direction and in thefront-rear direction. A plurality (two in this embodiment) of fuses 26are mounted on the fuse mounting portion 25 and are arrangedside-by-side in the right-left direction.

A lower end portion of the side wall located at the left end portion ofthe cover 15 is recessed slightly upward. Similarly, a lower end portionof the side wall located at the right end portion of the cover 15 isrecessed slightly upward. Accordingly, a gap into which the trunk cable12 can be inserted is formed between the lower end portions and thebottom wall 11A of the case 11.

Also, the lower end portion of the side wall located at the front endportion of the cover 15 is recessed slightly upward. Accordingly, a gapinto which the branch cable 13 can be inserted is formed between thislower end portion and the bottom wall 11A of the case 11.

As shown in FIG. 5, a shielding member mounting portion 28 on which acover shielding member 27 (an example of a shielding member), which willbe described later, is mounted protrudes downward from the lower side ofthe upper wall of the cover 15. The shielding member mounting portion 28is provided with a closed-end hole passing through its upper wall. Whena screw 29 is screwed into the closed-end hole from below in a state inwhich the screw 29 passes through the cover shielding member 27, thecover shielding member 27 is fixed to the cover 15.

Trunk cable 12

As shown in FIG. 3, the trunk cable 12 includes three power trunkconductors 30 (an example of the trunk conductor) arranged in a rearportion of the trunk cable 12, two signal trunk conductors 31 (anexample of the trunk conductor) that are arranged in a front portion ofthe trunk cable 12 and that are spaced apart from each other in thefront-rear direction, and two ground trunk conductors 32 (an example ofthe trunk conductor) arranged at positions sandwiching the signal trunkconductors 31 from the front and the rear. The power trunk conductors30, the signal trunk conductors 31, and the ground trunk conductors 32are elongated in the right-left direction, and are arranged side-by-sideand are spaced apart from each other in the front-rear direction. Thepower trunk conductors 30, the signal trunk conductors 31, and theground trunk conductors 32 have a long and flat plate shape.

The power trunk conductors 30, the signal trunk conductors 31, and theground trunk conductors 32 are made of an electrically conductivematerial. An example of the main component of the power trunk conductors30, the signal trunk conductors 31, and the ground trunk conductors 32is copper. More specifically, the power trunk conductors 30, the signaltrunk conductors 31, and the ground trunk conductors 32 are preferablyannealed copper wires.

FIG. 6 is an enlarged schematic cross-sectional view of a portion of thetrunk cable 12, showing a region where the power trunk conductors 30 arearranged. Also, FIG. 7 is an enlarged schematic cross-sectional view ofa portion of the trunk cable 12, showing a region where the signal trunkconductors 31 and the ground trunk conductors 32 are arranged. The powertrunk conductors 30, the signal trunk conductors 31, and the groundtrunk conductors 32 are arranged side-by-side and are spaced apart fromeach other in a state in which these trunk conductors are embedded in aconductor holding adhesive 33. The power trunk conductors 30, the signaltrunk conductors 31, and the ground trunk conductors 32 are electricallyinsulated by the conductor holding adhesive 33.

Insulating films 34 (an example of an insulating trunk coating) arelaminated on the upper side and the lower side of the conductor holdingadhesive 33. Specifically, it is possible to use a film made of aninsulating synthetic resin as the insulating film 34. Polyimide,polyester, polyphenylene sulfide, and the like can be suitably used asthe synthetic resin, for example.

As shown in FIG. 6, the two power trunk conductors 30 arranged atpositions closer to the rear portion of the trunk cable 12, and thepower trunk conductor 30 arranged at a position closer to the frontportion is arranged slightly apart from the others in the front-reardirection. The positioning holes 19A are formed in this region, avoidingthe power trunk conductors 30.

As shown in FIG. 7, a conductive shield layer 35 (an example of a trunkshield) and an insulating layer 36 (an example of an insulating trunkcoating) for covering the outer surface of the shield layer 35 areplaced on the upper side of the insulating film 34 laminated on theupper side of the conductor holding adhesive 33 at positionscorresponding to the signal trunk conductors 31 and the ground trunkconductors 32 that are arranged in the front portion of the trunk cable12. The shield layer 35 is made of a conductive material. It is possibleto use a metal film, a metal-vapor deposition film, a conductive wovenfabric, or a conductive nonwoven fabric as the material of the shieldlayer 35, for example. Examples of components exerting the conductivityin the shield layer 35 include aluminum, copper, nickel, silver, andiron, and, in particular, copper and aluminum, which are relativelyinexpensive and highly conductive, are suitable. Because the insulatinglayer 36 is similar to the above-described insulating film 34, itsredundant description is omitted. Although not shown in detail, theshield layer 35 and the ground trunk conductors 32 are electricallyconnected to each other.

The shield layer 35 and the insulating layer 36 are also placed on thelower side of the insulating film 34 laminated on the lower side of theconductor holding adhesive 33. The shield layer 35 and the insulatinglayer 36 are the same as those placed on the upper side of theinsulating film 34, and thus, these layers are given the same referencenumerals, and their redundant description is omitted.

Branch Cable 13

As shown in FIG. 3, the branch cable 13 includes three power branchconductors 37 (an example of the branch conductor) arranged on the rightside of the branch cable 13, two signal branch conductors 38 (an exampleof the branch conductor) that are arranged on the left side of thebranch cable 13, and that are spaced apart from each other in theright-left direction, and two ground branch conductors 39 (an example ofthe branch conductor) arranged at positions sandwiching the signalbranch conductors 38 from right and left. The power branch conductors37, the signal branch conductors 38, and the ground branch electricalpaths are elongated in the right-left direction, and are arrangedside-by-side and are spaced apart from each other in the front-reardirection. The power branch conductors 37, the signal branch conductors38, and the ground branch conductors 39 have a long and flat plateshape.

The power branch conductors 37, the signal branch conductors 38, and theground branch conductors 39 are made of an electrically conductivematerial. An example of the main component of the power branchconductors 37, the signal branch conductors 38, and the ground branchconductors 39 is copper. More specifically, the power branch conductors37, the signal branch conductors 38, and the ground branch conductors 39are preferably annealed copper wires.

FIG. 8 is an enlarged schematic cross-sectional view of a portion of thebranch cable 13, showing a region where the power branch conductors 37are arranged. Also, FIG. 9 is an enlarged schematic cross-sectional viewof a portion of the branch cable 13, showing a region where the signalbranch conductors 38 and the ground branch conductors 39 are arranged.The power branch conductors 37, the signal branch conductors 38, and theground branch conductors 39 are arranged side-by-side and are spacedapart from each other in a state in which these branch conductors areembedded in the conductor holding adhesive 40. The power branchconductors 37, the signal branch conductors 38, and the ground branchconductors 39 are electrically insulated by the conductor holdingadhesive 40.

As shown in FIG. 8, the two power branch conductors 37 arranged atpositions closer to a right end portion of the branch cable 13, and thepower branch conductor 37 arranged at a position closer to its left endportion is arranged slightly apart from the others in the right-leftdirection. The positioning holes 19B are formed in this region, avoidingthe power branch conductors 37.

Insulating films 41 (an example of an insulating branch coating) arelaminated on the upper side and the lower side of the conductor holdingadhesive 40. Specifically, it is possible to use a film made of aninsulating synthetic resin as the insulating film 41. Polyimide,polyester, polyphenylene sulfide, and the like can be suitably used asthe synthetic resin, for example.

As shown in FIG. 9, a conductive shield layer 42 (an example of a branchshield) and an insulating layer 43 (an example of an insulating branchcoating) for covering the outer surface of the shield layer 42 areplaced on the upper side of the insulating film 41 laminated on theupper side of the conductor holding adhesive 40 at positionscorresponding to the signal branch conductors 38 and the ground branchconductors 39 that are arranged in the front portion of the branch cable13. The shield layer 42 is made of a conductive material. It is possibleto use a metal film, a metal-vapor deposition film, a conductive wovenfabric, or a conductive nonwoven fabric as the material of the shieldlayer 42, for example. Examples of components exerting the conductivityin the shield layer 42 include aluminum, copper, nickel, silver, andiron, and, in particular, copper and aluminum, which are relativelyinexpensive and highly conductive, are suitable. Because the insulatinglayer 43 on the shield tape is similar to the above-described insulatingfilm 41, its redundant description is omitted. Although not shown indetail, the shield layer 42 and the ground branch conductors 39 areelectrically connected to each other.

The shield layer 42 and the insulating layer 43 are also placed on thelower side of the insulating film 41 laminated on the lower side of theconductor holding adhesive 40. The shield layer 42 and the insulatinglayer 43 are the same as those placed on the upper side of theinsulating film 41, and thus, these layers are given the same referencenumerals, and their redundant description is omitted.

Structure for Connecting Trunk Cable 12 and Branch Cable 13

Next, a structure for connecting the trunk cable 12 and the branch cable13 (an example of a structure for connecting flexible flat cables) willbe described. As shown in FIG. 3, on the bottom wall 11A of the case 11,the trunk cable 12 extends in the right-left direction at a positionlocated slightly forward of the front end portion of the branch cable13, which extends in the front-rear direction. The upper side of thetrunk cable 12 is provided with a plurality (three in this embodiment)of power trunk opening portions 44 from which the power trunk conductors30 are exposed due to the insulating film 34 being removed, at positionslocated slightly to the left of the left side edge of the branch cable13, that is, at positions closer to its rear portion. The power trunkopening portions 44 have a rectangular shape that is elongated in itsright-left direction. The power trunk opening portions 44 are arrangedside-by-side and are spaced apart from each other in the front-reardirection. The power trunk conductors 30 exposed from the power trunkopening portions 44 can be regarded as power trunk lands 45.

The upper side of the trunk cable 12 is provided with a plurality (twoin this embodiment) of signal trunk opening portions 46 from which thesignal trunk conductors 31 are exposed due to the insulating film 34,the shield layer 35, and the insulating layer 36 being removed, and aplurality (two in this embodiment) of ground trunk opening portions 47from which the ground trunk conductors 32 are exposed, at positionslocated slightly to the left of the left side edge of the branch cable13, that is, at positions closer to its front portion. The signal trunkopening portions 46 and the ground trunk opening portions 47 have arectangular shape that is elongated in the right-left direction, and arearranged side-by-side and are spaced apart from each other in thefront-rear direction. The signal trunk conductors 31 exposed from thesignal trunk opening portions 46 can be regarded as signal trunk lands48. Also, the ground trunk conductors 32 exposed from the ground trunkopening portions 47 can be regarded as ground trunk lands 49.

The power trunk opening portions 44, the signal trunk opening portions46, and the ground trunk opening portions 47 are formed using a knownmethod such as punching, drilling, or laser processing, for example.

The upper side of the branch cable 13 is provided with a plurality(three in this embodiment) of power branch opening portions 50 fromwhich the power branch conductors 37 are exposed due to the insulatingfilm 34 being removed, at positions located slightly rearward of itsfront end portion. The power branch opening portions 50 have arectangular shape that is elongated in the front-rear direction. Thepower branch opening portions 50 are arranged side-by-side and arespaced apart from each other in the right-left direction. The powerbranch conductors 37 exposed from the power branch opening portions 50can be regarded as power branch lands 51.

The upper side of the branch cable 13 is provided with, at positionslocated on the left side of the power branch opening portions 50, aplurality of (two in this embodiment) of signal branch opening portions52 from which the signal branch conductors 38 are exposed due to theinsulating film 41, the shield layer 42, and the insulating layer 43being removed, and a plurality (two in this embodiment) of ground branchopening portions 53 from which the ground branch conductors 39 areexposed. The signal branch opening portions 52 and the ground branchopening portions 53 have a rectangular shape that is elongated in thefront-rear direction, and are arranged side-by-side and are spaced apartfrom each other in the right-left direction. The signal branchconductors 38 exposed from the signal branch opening portions 52 can beregarded as signal branch lands 54. Also, the ground branch conductors39 exposed from the ground branch opening portions 53 can be regarded asground branch lands 55.

The power branch opening portions 50, the signal branch opening portions52, and the ground branch opening portions 53 can be formed using amethod similar to that for the power trunk opening portions 44, thesignal trunk opening portion 46, and the ground trunk opening portions47.

As shown in FIGS. 10 and 11, out of the power trunk lands 45 formed onthe trunk cable 12, the first and second power trunk lands 45 from therear are connected to two trunk-side terminal portions 57A formed at aleft end portion of a first trunk-side bus bar 56 (an example of theconductive relay path 14). The trunk-side terminal portions 57A are bentdownward in a crank shape. The power trunk lands 45 and the trunk-sideterminal portions 57A are electrically connected to each other, using aknown method such as soldering, brazing, resistance welding, or laserwelding. The first trunk-side bus bar 56 is bent in an L-shape whenviewed from above. A front end portion of the first trunk-side bus bar56 is bent upward and branches to two portions, and can be regarded as afuse connection terminal portion 58A that is capable of holding a leadportion 59 of a fuse 26 (an example of the conductive relay path 14),which will be described later.

Out of the power branch lands 51 formed on the branch cable 13, thefirst and second power branch lands 51 from the right are connected totwo branch-side terminal portions 61A formed at a front end portion ofthe first branch-side bus bar 60 (an example of the conductive relaypath 14). The branch-side terminal portions 61A are bent downward in acrank shape. The power branch lands 51 and the branch-side terminalportions 61A are electrically connected to each other, using a knownmethod such as soldering, brazing, resistance welding, or laser welding.The first branch-side bus bar 60 is bent in a crank shape when viewedfrom the side. A front end portion of the first branch-side bus bar 60is bent upward and branches to two portions, and can be regarded as afuse connection terminal portion 58C that is capable of holding a leadportion 59 of a fuse 26, which will be described later.

When the lead portion 59 of the fuse 26 is held by the fuse connectionterminal portion 58A of the first trunk-side bus bar 56, and is held bythe fuse connection terminal portion 58C of the first branch-side busbar 60, the first trunk-side bus bar 56 and the first branch-side busbar 60 are electrically connected to each other via the fuse 26.

Out of the power trunk lands 45 formed on the trunk cable 12, the thirdpower trunk land 45 from the rear is connected to the trunk-sideterminal portion 57B formed at a left end portion of the secondtrunk-side bus bar 62 (an example of the conductive relay path 14). Thetrunk-side terminal portion 57B is bent downward in a crank shape. Thepower trunk land 45 and the trunk-side terminal portion 57B areelectrically connected to each other, using a known method such assoldering, brazing, resistance welding, or laser welding. The secondtrunk-side bus bar 62 is bent in an L-shape when viewed from above. Afront end portion of the second branch-side bus bar 62 is bent upwardand branches to two portions, and can be regarded as a fuse connectionterminal portion 58B that is capable of holding a lead portion 59 of afuse 26, which will be described later.

Out of the power branch lands 51 formed on the branch cable 13, thethird power branch land 51 from the right is connected to a branch-sideterminal portion 61B formed at a front end portion of the secondbranch-side bus bar 63 (an example of the conductive relay path 14). Thebranch-side terminal portion 61B is bent downward in a crank shape. Thepower branch land 51 and the branch-side terminal portion 61B areelectrically connected to each other, using a known method such assoldering, brazing, resistance welding, or laser welding. The secondbranch-side bus bar 63 is bent in a crank shape when viewed from theside. A front end portion of the second branch-side bus bar 63 can beregarded as a fuse connection terminal portion 58D that is bent upwardand branches to two portions, and that is capable of holding a leadportion 59 of a fuse 26, which will be described later.

The fuse connection terminal portions 58A, 58B, 58C, and 58D arearranged inside the fuse mounting portion 25 provided on the cover 15 ina state in which the cover 15 and the case 11 are assembled into asingle body.

When the lead portions 59 of the fuse 26 are held by the fuse connectionterminal portion 58B of the second trunk-side bus bar 62 and by the fuseconnection terminal portion 58D of the second branch-side bus bar 63,the second trunk-side bus bar 62 and the second branch-side bus bar 63are electrically connected to each other via the fuse 26.

The signal trunk lands 48 formed on the trunk cable 12 are electricallyconnected to the signal branch lands 54 formed on the branch cable 13via the relay bus bars 64 (an example of the conductive relay path 14).Accordingly, the signal trunk conductors 31 of the trunk cable 12 andthe signal branch conductors 38 of the branch cable 13 are electricallyconnected to each other. In this embodiment, the two signal trunk lands48 provided on the trunk cable 12 and the two signal branch lands 54provided on the branch cable 13 are respectively connected to each otherby the two relay bus bars 64.

Each relay bus bar 64 includes a trunk-side terminal portion 57Cconnected to the signal trunk land 48, and a branch-side terminalportion 61C connected to the signal branch land 54. In this embodiment,the two relay bus bars 64 are spaced apart from each other. The relaybus bars 64 are bent in an L-shape when viewed from above. Thebranch-side terminal portions 57C and the branch-side terminal portions61C are bent downward in a crank shape.

The signal trunk lands 48 and the trunk-side terminal portions 57C areelectrically connected to each other, using a known method such assoldering, brazing, resistance welding, or laser welding. Also, thesignal branch lands 54 and the branch-side terminal portions 61C areelectrically connected to each other, using a known method such assoldering, brazing, resistance welding, or laser welding.

The two ground trunk lands 49 formed on the trunk cable 12 arerespectively connected to two trunk-side ground terminal portions 66formed at the left end portion of a base shielding member 65 (an exampleof the shielding member). The trunk-side ground terminal portions 66 arebent downward in a crank shape. The ground trunk lands 49 and thetrunk-side ground terminal portions 66 are electrically connected toeach other, using a known method such as soldering, brazing, resistancewelding, or laser welding. The base shielding member 65 includes a baseplate portion 67 having a substantially rectangular shape when viewedfrom above. The above-described trunk-side ground terminal portions 66are bent downward from the base plate portion 67 in a crank shape. Thebase plate portion 67 includes a shield-side first slit 68 that is bentin an L-shape when viewed from above, and a shield-side second slit 69that extends in the front-rear direction when viewed from above, at aposition located on the left side of the shield-side first slit 68.

The two ground branch lands 55 formed on the branch cable 13 arerespectively connected to the two branch-side ground terminal portions70 formed at the front end portion of the base shielding member 65. Thebranch-side ground terminal portions 70 are bent downward from the baseplate portion 67 in a crank shape. The ground branch lands 55 and thebranch-side ground terminal portions 70 are electrically connected toeach other, using a known method such as soldering, brazing, resistancewelding, or laser welding.

The first trunk-side bus bar 56, the first branch-side bus bar 60, thesecond trunk-side bus bar 62, the second branch-side bus bar 63, and therelay bus bars 64 are arranged on an upper side of the insulating plate71, which is made of an insulating synthetic resin. The upper side ofthe insulating plate 71 is provided with multiple lines of ribs 72 thatprotrude upward. The first trunk-side bus bar 56, the first branch-sidebus bar 60, the second trunk-side bus bar 62, the second branch-side busbar 63, and the relay bus bars 64 are electrically insulated from eachother due to these ribs 72 being interposed between them.

As shown in FIG. 10, the lower side of the insulating plate 71 isprovided with a plurality of legs 73 that protrude downward. Due tothese legs 73, the insulating plate 71 is spaced apart from the bottomwall 11A of the case 11 in a state in which the insulating plate 71 isplaced on the bottom wall 11A of the case 11.

The base shielding member 65 is arranged on the lower side of theinsulating plate 71. The base plate portion 67 of the base shieldingmember 65 is arranged at a position overlapping the two relay bus bars64 via the insulating plate 71, when viewed from above. The insulatingplate 71 is provided with an insulating plate-side first slit 74 and aninsulating plate-side second slit 75, respectively at positions thatcorrespond to a shield-side first slit 68 and a shield-side second slit69 of the base shielding member 65 when the base shielding member 65 isarranged on the insulating plate 71.

The insulating plate 71, the first trunk-side bus bar 56, the firstbranch-side bus bar 60, the second trunk-side bus bar 62, the secondbranch-side bus bar 63, and the relay bus bars 64, and the baseshielding member 65 are fixed using a known method such as gluing orheat welding.

The cover shielding member 27 (an example of the shielding member)screwed to the cover 15 is arranged above the insulating plate 71. Thecover shielding member 27 includes an upper wall 76, and a first sidewall 77 and a second side wall 78 that extend downward from side edgesof the upper wall 76. The first side wall 77 is bent in an L-shape whenviewed from above. The first side wall 77 has a shape corresponding tothe above-described shield-side first slit 68 and insulating plate-sidefirst slit 74, and the lower end portion of the first side wall 77 isinserted into the shield-side first slit 68 and the insulatingplate-side first slit 74 from above, and passes through the insulatingplate 71 downward.

The second side wall 78 extends in the front-rear direction when viewedfrom above. The second side wall 78 has a shape corresponding to theabove-described shield-side second slit 69 and insulating plate-sidesecond slit 75, and the lower end portion of the second side wall 78 isinserted into the shield-side second slit 69 and the insulatingplate-side second slit 75 from above, and passes through the insulatingplate 71 downward.

The base shielding member 65 is arranged below the relay bus bars 64 viathe insulating plate 71, and the cover shielding member 27 is arrangedabove and on the sides of the relay bus bars 64 in a state in which thecover 15 is mounted on the case 11. Accordingly, the relay bus bars 64are enclosed by the base shielding member 65 and the cover shieldingmember 27. In this embodiment, the base shielding member 65 and thecover shielding member 27 are not electrically connected to each other.

The first trunk-side bus bar 56, the first branch-side bus bar 60, thesecond trunk-side bus bar 62, the second branch-side bus bar 63, therelay bus bars 64, the base shielding member 65, and the cover shieldingmember 27 have predetermined shapes obtained by pressing a metal plate.The metal plate may be selected from metals such as copper, copperalloys, aluminum, and aluminum alloys as needed. A plating layer mayalso be formed on the surfaces of the first trunk-side bus bar 56, thefirst branch-side bus bar 60, the second trunk-side bus bar 62, thesecond branch-side bus bar 63, the relay bus bars 64, the base shieldingmember 65, and the cover shielding member 27. Metal constituting aplating layer may be selected from metals such as tin and nickel asneeded.

Example of Manufacturing Process in this Embodiment

Next, an example of a process for manufacturing the branch box 10according to this embodiment will be described below. Note that theprocess for manufacturing the branch box 10 is not limited to thefollowing description.

The case 11 and the cover 15 are formed through injection molding with asynthetic resin. Also, the insulating plate 71 is formed throughinjection molding with a synthetic resin.

The power trunk opening portions 44, the signal trunk opening portions46, and the ground trunk opening portions 47 are formed in the uppersurface of the trunk cable 12 and respectively expose the power trunklands 45, the signal trunk lands 48, and the ground trunk lands 49.

The power branch opening portions 50, the signal branch opening portions52, and the ground branch opening portions 53 are formed in the uppersurface of the branch cable 13 and respectively expose the power branchlands 51, the signal branch lands 54, and the ground branch lands 55.

As shown in FIG. 12, the left holding portion 20A, the right holdingportion 20B, and the branch holding portion 20C that are provided in thecase 11 are flipped upward by rotating them around the hinges 21.

As shown in FIG. 12, the trunk cable 12 is placed on the rear portion ofthe case 11. At this time, the positioning pins 18A of the case 11 areinserted into the positioning holes 19A of the trunk cable 12.Accordingly, the trunk cable 12 is placed on the case 11 in a state inwhich the trunk cable 12 is positioned relative to the case 11.

The branch cable 13 is placed on a front portion of the case 11. At thistime, the positioning pins 18B of the case 11 are inserted into thepositioning holes 19B of the branch cable 13. Accordingly, the branchcable 13 is placed on the case 11 in a state in which the branch cable13 is positioned relative to the case 11.

As shown in FIG. 13, the left holding portion 20A and the right holdingportion 20B are moved toward the bottom wall 11A of the case 11 byrotating them around the hinges 21. The locking claws 22 of the leftholding portion 20A and the right holding portion 20B, and the lockedportions 23 of the case 11 are elastically engaged with each other.Accordingly, the trunk cable 12 is held between the left holding portion20A and the right holding portion 20B, and the bottom wall 11A of thecase 11.

The branch holding portion 20C is moved toward the bottom wall 11A ofthe case 11 by rotating the branch holding portion 20C around the hinge21. The locking claws 22 of the branch holding portion 20C, and thelocked portions 23 of the case 11 are elastically engaged with eachother. Accordingly, the branch cable 13 is held between the branchholding portion 20C and the bottom wall 11A of the case 11.

Solder paste is applied, using a known method such as screen printing,onto the upper surfaces of the power trunk lands 45, the signal trunklands 48, the ground trunk lands 49, the power branch lands 51, thesignal branch lands 54, and the ground branch lands 55.

The first trunk-side bus bar 56, the first branch-side bus bar 60, thesecond trunk-side bus bar 62, the second branch-side bus bar 63, therelay bus bars 64, the base shielding member 65, and the cover shieldingmember 27 are formed by pressing a metal plate.

The first trunk-side bus bar 56, the first branch-side bus bar 60, thesecond trunk-side bus bar 62, the second branch-side bus bar 63, and therelay bus bars 64 are arranged on the upper side of the insulating plate71, and the base shielding member 65 is arranged on the lower side ofthe insulating plate 71, and they are fixed to the insulating plate 71through heat welding.

As shown in FIGS. 14 and 16, an assembly in which the first trunk-sidebus bar 56, the first branch-side bus bar 60, the second trunk-side busbar 62, the second branch-side bus bar 63, the relay bus bars 64, andthe base shielding member 65 are fixed to the insulating plate 71 isplaced on the trunk cable 12 and the branch cable 13 that are placed onthe case 11. This operation may be performed by an operator, or amachine such as a mounter, for example.

Lower end portions of the trunk-side terminal portions 57A and 57B ofthe first trunk-side bus bar 56 and the second trunk-side bus bar 62 areplaced on the power trunk lands 45, lower end portions of the trunk-sideterminal portions 57C of the relay bus bars 64 are placed on the signaltrunk lands 48, and lower end portions of the trunk-side ground terminalportions 66 of the base shielding member 65 are placed on the groundtrunk lands 49.

Also, lower end portions of the branch-side terminal portions 61A and61B of the first branch bus bar and the second branch bus bar are placedon the power branch lands 51, lower end portions of the branch-sideterminal portions 61C of the relay bus bars 64 are placed on the signalbranch lands 54, and lower end portions of the branch-side groundterminal portions 70 of the base shielding member 65 are placed on theground branch lands 55.

The power trunk lands 45 are soldered to the lower end portions of thetrunk-side terminal portions 57A and 57B of the first trunk-side bus bar56 and the second trunk-side bus bar 62, the signal trunk lands 48 aresoldered to the lower end portions of the trunk-side terminal portions57C of the relay bus bars 64, and the ground trunk lands 49 are solderedto the lower end portions of the trunk-side ground terminal portions 66of the base shielding member.

Also, the power branch lands 51 are soldered to the lower end portionsof the branch-side terminal portions 61A and 61B of the first branch busbar and the second branch bus bar, the signal branch lands 54 aresoldered to the lower end portions of the branch-side terminal portions61C of the relay bus bars 64, and the ground branch lands 55 aresoldered to the lower end portions of the branch-side ground terminalportions 70 of the base shielding member 65.

Soldering may be performed by an operator using a soldering iron, or mayalso be performed through known reflow soldering, and any methods can beselected as needed.

As shown in FIG. 5, the cover shielding member 27 is screwed onto thelower side of the upper plate of the cover 15 by the screw 29.

As shown in FIG. 15, the cover 15 is mounted on the case 11 from above.The case 11 and the cover 15 are assembled into a single body throughelastic engagement between the locking portions 16 provided on the sidewalls of the case 11 and the locking reception portions 17 provided onthe side walls of the cover 15.

As shown in FIG. 17, the two fuses 26 are mounted on the fuse mountingportion 25 provided on the cover 15 from above. When the leads of thefuses 26 are held by fuse connection terminal portions 58A, 58B, 58C,and 58D, one fuse 26 is electrically connected to the first trunk-sidebus bar 56 and the first branch-side bus bar 60, and the other fuse 26is electrically connected to the second trunk-side bus bar 62 and thesecond branch-side bus bar 63. Accordingly, the branch box 10 accordingto this embodiment is complete (see FIG. 1). The branch box 10 can bearranged in a vehicle in any orientation.

Effects of this Embodiment

Next, effects of this embodiment will be described below. A structurefor connecting the trunk cable 12 and the branch cable 13 according tothis embodiment includes the trunk cable 12, the branch cable 13, andthe conductive relay path 14. The trunk cable 12 includes power trunkconductors 30, signal trunk conductors 31, insulating films 34 forcovering the power trunk conductors 30, insulating films 34 andinsulating layers 36 for covering the signal trunk conductors 31. Thebranch cable 13 includes power branch conductors 37, signal branchconductors 38, insulating films 41 covering the power branch conductors37, insulating films 41 and insulating layers 43 covering the signaltrunk conductors 38.

The power trunk conductors 30 and the power branch conductors 37 areelectrically connected to each other by the first trunk-side bus bar 56,the fuse 26, and the first branch-side bus bar 60, and are electricallyconnected to each other by the second trunk-side bus bar 62, the fuse26, and the second branch-side bus bar 63. The signal trunk conductors31 and the signal branch conductors 38 are electrically connected toeach other by the relay bus bars 64.

The power trunk conductors 30 include the power trunk lands 45 exposedfrom the power trunk opening portion 44 provided in the insulating film34, and the power branch conductors 37 include the power branch lands 51exposed from a power branch opening portion 50 provided in theinsulating film 41. The first trunk-side bus bar 56 includes thetrunk-side terminal portions 57A connected to the power trunk lands 45,and the second trunk-side bus bar 62 includes the trunk-side terminalportion 57B. The first branch-side bus bar 60 has the branch-sideterminal portions 61A connected to the power branch land 51, and thesecond branch-side bus bar includes the branch-side terminal portion 61Bconnected to the power branch land 51.

The signal trunk conductors 31 include the signal trunk lands 48 exposedfrom the signal trunk opening portion 46 provided in the insulating film34, the shield layer 35, and the insulating layer 36. The signal branchconductors 38 include the signal branch lands 54 exposed from the signalbranch opening portion 52 provided in the insulating film 34, the shieldlayer 35, and the insulating layer 36. The relay bus bars 64 include thetrunk-side terminal portions 57C connected to the signal trunk land 48,and the branch-side terminal portion 61C connected to the signal branchland 54.

According to the above-described configuration, the power trunk landsprovided on the power trunk conductors 30 and the trunk-side terminalportions 57A and 57B are connected to each other, and the power branchlands 51 provided on the power branch conductors 37 and the branch-sideterminal portions 61A and 61B are connected to each other. Also, thesignal trunk lands 48 provided on the signal trunk conductors 31 and thetrunk-side terminal portions 57C are connected to each other, and thesignal branch lands 54 provided on the signal branch conductors 38 andthe branch-side terminal portions 61C are connected to each other.Accordingly, compared to a case where a plurality of flexible flatcables are connected to each other by inserting a connection member intothe conductors, it is possible to electrically connect the power trunkconductors 30 of the trunk cable 12 and the power branch conductors 37of the branch cable 13 in a larger area, and it is also possible toelectrically connect the signal trunk conductors 31 of the trunk cable12 and the signal branch conductors 38 of the branch cable 13. As aresult, it is possible to improve the reliability of electricalconnection between the trunk cable 12 and the branch cable 13.

In this embodiment, the signal trunk conductors 31 of the trunk cable 12and the signal branch conductors 38 of the branch cable 13 can beelectrically connected to each other by the relay bus bars 64.

In this embodiment, the power trunk conductors 30 of the trunk cable 12and the power branch conductors 37 of the branch cable 13 can beelectrically connected to each other, via the fuse 26, by the firsttrunk-side bus bar 56, which includes the trunk-side terminal portions57A, the fuse 26 connected to the fuse connection terminal portion 58Aprovided on the first trunk-side bus bar 56, and the first branch-sidebus bar 60 that includes the fuse connection terminal portion 58Cconnected to the fuse 26 and the branch-side terminal portions 61A.Also, the power trunk conductors 30 of the trunk cable 12 and the powerbranch conductors 37 of the branch cable 13 can be electricallyconnected to each other, via the fuse 26, by the second trunk-side busbar 62 that includes the trunk-side terminal portion 57B, the fuse 26connected to the fuse connection terminal portion 58B provided on thesecond trunk-side bus bar 62, and the second branch-side bus bar 63 thatincludes the fuse connection terminal portion 58D connected to the fuse26 and the branch-side terminal portion 61B.

According to the above-described configuration, it is possible toinhibit overcurrent from flowing between the trunk cable 12 and thebranch cable 13.

According to this embodiment, the first trunk-side bus bar 56, the firstbranch-side bus bar 60, the second trunk-side bus bar 62, the secondbranch-side bus bar 63, and the relay bus bars 64 are mounted on theinsulating plate 71, which is made of an insulating synthetic resin.

According to the above-described configuration, when the insulatingplate 71 on which the first trunk-side bus bar 56, the first branch-sidebus bar 60, the second trunk-side bus bar 62, the second branch-side busbar 63, and the relay bus bars 64 are mounted is placed at apredetermined position of the trunk cable 12 and the branch cable 13,the trunk-side terminal portions 57A and 57B can be placed on the powertrunk lands 45 and the signal trunk lands 48, and the branch-sideterminal portions 61A and 61B can be placed on the power branch lands 51and the signal branch lands 54. As a result, it is possible to improvethe efficiency of operations for connecting the first trunk-side bus bar56 and the second trunk-side bus bar 62 to the power trunk lands 45, andoperations for connecting the first branch-side bus bar 60 and thesecond branch-side bus bar 63 to the power branch lands 51. Also, it ispossible to improve the efficiency of operations for connecting therelay bus bars 64, the signal trunk lands 48, and the signal branchlands 54.

The structure for connecting the trunk cable 12 and the branch cable 13according to this embodiment includes the trunk cable 12, which includesthe signal trunk conductors 31; the ground trunk conductors 32; theshield layer 35 that is electrically connected to the ground trunkconductors 32 and encloses the signal trunk conductors 31 toelectromagnetically shield the signal trunk conductors 31; and theinsulating layer 36 for covering the signal trunk conductors 31, theground trunk conductors 32, and the shield layer 35, and the branchcable 13, which includes the signal branch conductors 38; the groundbranch conductors 39; the shield layer 42 that is electrically connectedto the ground branch conductors 39 and encloses the signal branchconductors 38 to electromagnetically shield the signal branch conductors38; and the insulating layer 43 for covering the signal branchconductors 38, the ground branch conductors 39, and the shield layer 42,the relay bus bars 64, which include the trunk-side terminal portions57C connected to the signal trunk conductors 31, and the branch-sideterminal portions 61C connected to the signal branch conductors 38, andthe base shielding member 65 and the cover shielding member 27 forenclosing the relay bus bars 64 to electromagnetically shield the relaybus bars 64.

According to the above-described configuration, it is possible toelectromagnetically shield the relay bus bars 64 by the base shieldingmember 65 and the cover shielding member 27. Accordingly, the signaltrunk conductors 31 of the trunk cable 12 and the signal branchconductors 38 of the branch cable 13 are electrically connected to eachother in a state in which these conductors are electromagneticallyshielded.

Also, according to this embodiment, the base shielding member 65includes the trunk-side ground terminal portions 66 connected to theground trunk conductors 32, and the branch-side ground terminal portions70 connected to the ground branch conductors 39. Accordingly, it ispossible to improve shield performance for the relay bus bars 64.

Also, according to this embodiment, it is possible to shield the relaybus bars 64 by connecting the base shielding member 65 to the groundtrunk conductors 32 and the ground branch conductors 39, and arrangingthe relay bus bars 64 between the base shielding member 65 and the covershielding member 27.

The branch box 10 according to this embodiment includes the case 11, thetrunk cable 12 fixed to the case 11, the branch cable 13 fixed to thecase 11 in a state in which the branch cable 13 is electricallyconnected to the trunk cable 12, and the cover 15 that is mounted on thecase 11 and covers the trunk cable 12 and the branch cable 13.

The branch cable 12 includes the power branch conductors 30 and theinsulating films 34 covering the power trunk conductors 30, and thebranch cable 13 includes the power branch conductors 37 and theinsulating films 41 covering the power branch conductors 37. Theconductive relay path 14 (the first trunk-side bus bar 56, the secondtrunk-side bus bar 62, the fuses 26, the first branch-side bus bar 60,and the second branch-side bus bar 63) is electrically connected to thepower trunk lands 45 in the power trunk conductors 30 that are exposedfrom the power trunk opening portions 44 provided in the insulatingfilms 34, and, the power branch lands 51 in the power branch conductors37 that are exposed from the power branch opening portions 50 providedin the insulating films 41.

Also, the trunk cable 12 includes the signal trunk conductors 31, andthe insulating films 34 and the insulating layers 36 covering the signaltrunk conductors 31, and the branch cable 13 includes the signal branchconductors 38, and the insulating films 41 and the insulating layers 43covering the signal branch conductors 38. The conductive relay path 14(the relay bus bars 64) is electrically connected to the signal trunklands 48 in the signal trunk conductors 31, which are exposed from thesignal trunk opening portions 46 provided in the insulating films 34 andthe insulating layers 36, and the signal branch lands 54 in the signalbranch conductors 38, which are exposed from the signal branch openingportions 52 provided in the insulating films 41 and the insulatinglayers 43.

According to the above-described configuration, when the trunk cable 12and the branch cable 13 are fixed to the case 11, it is possible toelectrically connect the trunk cable 12 and the branch cable 13 by theconductive relay path 14 in a state in which the trunk cable 12 ispositioned relative to the branch cable 13.

According to this embodiment, the case 11 includes the bottom wall 11A,and the left holding portion 20A and the right holding portion 20B forholding the trunk cable 12 between the case 11 and the bottom wall 11A,and the branch holding portion 20C for holding the branch cable 13between the case 11 and the bottom wall 11A.

According to the above-described configuration, it is possible to fixthe trunk cable 12 to the case 11 by the left holding portion 20A andthe right holding portion 20B, and to fix the branch cable 13 to thecase 11 by the branch holding portion 20C.

According to this embodiment, the case 11 has the positioning pins 18Aand 18B protruding from the bottom wall 11A, positioning holes 19A passthrough the trunk cable 12, and the positioning holes 19B pass throughthe branch cable 13.

According to the above-described configuration, it is possible toreliably fix the trunk cable 12 and the branch cable to the case 11.

Embodiment 2

Next, a branch box 80 according to Embodiment 2 of technology disclosedin this specification will be described with reference to FIGS. 18 to25.

Cover 81

As shown in FIG. 19, a trunk operation hole 82 that extends in thefront-rear direction passes through a region at a rear portion of theupper wall of a cover 81, the region extending in the right-leftdirection and being located slightly on the left side of this rearportion. The trunk operation hole 82 has a rectangular shape when viewedfrom above. A hole edge portion of the trunk operation hole 82 can beregarded as a frame portion 83 that protrudes slightly upward from theupper wall of the cover 81. A front end portion of the frame portion 83is provided with a subcover locking reception portion 85 that protrudesforward and to which a subcover locking claw 84, which will bedescribed, is locked.

A rear end portion of the trunk operation hole 82 is provided, as asingle body with the cover 81, with a subcover 86 that extends rearwardvia a hinge 87. The trunk subcover 86 is elongated in the front-reardirection, and the size of the trunk subcover 86 is the same as that ofthe trunk operation hole 82, or is slightly larger than the size of thetrunk operation hole 82 to cover the trunk operation hole 82 (see FIG.18). A rear end portion of the trunk subcover 86 is provided with asubcover locking claw 84 capable of elastic deformation. The trunksubcover 86 rotates around the hinge 87 due to the hinge 87 undergoingdeformation, and covers the trunk operation hole 82. At this time, whenthe subcover locking claw 84 elastically locks to the subcover lockingreception portion 85, the trunk operation hole 82 is kept covered by thetrunk subcover 86.

As shown in FIG. 19, a branch operation hole 88 that extends in theright-left direction vertically passes through a portion of the upperwall of the cover 81 that protrudes forward, at a front position of thefuse mounting portion 25. The brunch operation hole 88 has a rectangularshape when viewed from above. A hole edge portion of the branchoperation hole 88 can be regarded as a frame portion 83 that protrudesslightly upward from the upper wall of the cover 81. A left end portionof the frame portion 83 is provided with a subcover locking receptionportion 85 that protrudes forward and to which the subcover locking claw84 is locked.

A right end portion of the branch operation hole 88 is provided, as asingle body with the cover 81, with a branch subcover 90 that extends tothe right via the hinge 87. The branch subcover 90 is elongated in theright-left direction, and the size of the branch subcover 90 is the sameas that of the branch operation hole 88, or is slightly larger than thesize of the branch operation hole 88 to cover the branch operation hole88 (see FIG. 18). A right end portion of the branch subcover 90 isprovided with a subcover locking claw 84 capable of elastic deformation.The branch subcover 90 rotates around the hinge 87 due to the hinge 87undergoing deformation, and covers the branch operation hole 88. At thistime, when the subcover locking claw 84 elastically locks to thesubcover locking reception portion 85, the branch operation hole 88 iskept covered by the branch subcover 90.

As shown in FIG. 22, a wiring portion 91 protrudes downward from a lowerside of the upper wall of the cover 81 where the first trunk-side busbar 56, the first branch-side bus bar 60, the second trunk-side bus bar62, the second branch-side bus bar 63, and the relay bus bars 64 arearranged. The lower side of the wiring portion 91 is provided withmultiple lines of ribs 92 that protrude downward. The first trunk-sidebus bar 56, the first branch-side bus bar 60, the second trunk-side busbar 62, the second branch-side bus bar 63, and the relay bus bars 64 areelectrically insulated from each other due to these ribs 92 beinginterposed between them. The wiring portion 91, and the first trunk-sidebus bar 56, the first branch-side bus bar 60, the second trunk-side busbar 62, the second branch-side bus bar 63, and the relay bus bars 64 arefixed to each other, using a known method such as gluing or heatwelding.

As shown in FIG. 21, the wiring portion 91 is provided with a mountingrecess 94 that is recessed upward and on which the cover shieldingmember 93 is mounted. The mounting recess 94 is larger than the outershape of the cover shielding member 93, and is capable of housing thecover shielding member 93. The cover shielding member 93 is screwed tothe cover 81 with the screw 29.

Lower end portions of side walls of the cover shielding member 93 areprovided with cover-side connection pieces 95 that protrude downward.The cover-side connection pieces 95 have a rectangular shape when viewedfrom above.

As shown in FIG. 23, the insulating plate 96 made of an insulatingsynthetic resin is mounted on the wiring portion 91 from below. Sidesurfaces of the wiring portion 91 are provided with locking portions 97that protrude outward (see FIG. 20). The upper wall of the cover 81 isprovided with die-cutting holes 98 for injection-molding the lockingportions 97 at positions corresponding to the locking portions 97. Theinsulating plate 96 is provided with gate-shaped locking receptionportions 99 that protrude upward and are elastically locked to thelocking portions 97, at positions corresponding to the locking portions97. When the locking reception portions 99 are elastically locked to thelocking portions 97, the insulating plate 96 is attached to the wiringportion 91. Accordingly, the first trunk-side bus bar 56, the firstbranch-side bus bar 60, the second trunk-side bus bar 62, the secondbranch-side bus bar 63, and the relay bus bars 64 are held between thewiring portion 91 and the insulating plate 96.

Base Shielding Member 100

As shown in FIG. 24, a base shielding member 100 is arranged on thelower side of the insulating plate 96. The base shielding member 100 hasan L-shape when viewed from above. The relay bus bars 64 and the baseshielding member 100 are arranged overlapping each other vertically whenviewed from above in a state in which the relay bus bars 64 are attachedto the wiring portion 91 of the cover 81, and the base shielding member100 is attached to the lower side of the insulating plate 96. The outershape of the base shielding member 100 is slightly larger than a spacein which the relay bus bars 64 are arranged. Accordingly, the baseshielding member 100 can inhibit noise from entering the relay bus bars64 from below.

Side edges of the base shielding member 100 are provided with base-sideconnection pieces 101 that extend downward, at positions correspondingto the cover-side connection pieces 95 formed on the cover shieldingmembers 93. The base-side connection pieces 101 have a rectangular shapewhen viewed from the side. The size of the base-side connection pieces101 and the size of the cover-side connection pieces 95 provided on thecover 81 are substantially the same. The cover-side connection pieces 95and the base-side connection pieces 101 are in contact with each otherin a state in which the cover shielding member 93 and the base shieldingmember 100 are mounted on the cover 81. Accordingly, the cover shieldingmember 93 and the base shielding member 100 are electrically connectedto each other.

Trunk Operation Hole 82 and Branch Operation Hole 89

As shown in FIG. 20, when the cover 15 in which the trunk subcover 86and the branch subcover 90 are opened is attached to the case 11 towhich the trunk cable 12 and the branch cable 13 are fixed atpredetermined positions, the power trunk opening portions 44, the powertrunk lands 45, the trunk-side terminal portions 57A of the firsttrunk-side bus bar 56, the trunk-side terminal portion 57B of the secondtrunk-side bus bar 62, the signal trunk opening portions 46, the signaltrunk lands 48, the trunk-side terminal portions 57C of the relay busbars 64, the ground trunk opening portions 47, the ground trunk lands49, and the trunk-side ground terminal portions 66 of the base shieldingmember 100 are exposed from the trunk operation holes 82. Accordingly,by inserting a jig (not shown) such as a soldering iron, for example,into the cover 81 through the trunk operation hole 82, it is possible toconnect the power trunk lands 45 and the trunk-side terminal portions57A and 57B of the first trunk-side bus bar 56 and the second trunk-sidebus bar 62, connect the signal trunk lands 48 and the trunk-sideterminal portions 57C of the relay bus bars 64, and connect the groundtrunk lands 49 and the trunk-side ground terminal portions 66 of thebase shielding member 100.

Also, the power branch opening portions 50, the power branch lands 51,the branch-side terminal portions 61A of the first branch-side bus bar60, the branch-side terminal portion 61B of the second branch-side busbar 63, the signal branch opening portions 52, the signal branch lands54, the branch-side terminal portions 61C of the relay bus bars 64, theground branch opening portions 53, the ground branch lands 55, and thebranch-side ground terminal portions 70 of the base shielding member 100are exposed from the branch operation hole 88. Accordingly, by insertinga jig such as a soldering iron, for example, into the cover 81 throughthe branch operation hole 88, it is possible to connect the power branchlands 51 and the branch-side terminal portions 61A and 61B of the firstbranch-side bus bar 60 and the second branch-side bus bar 63, connectthe signal branch lands 54 and the branch-side terminal portions 61C ofthe relay bus bars 64, and connect the ground branch lands 55 and thebranch-side ground terminal portions 70 of the base shielding member100.

Because configurations other than the above are substantially the sameas that of Embodiment 1, the same members are given the same referencenumerals, and their redundant description will be omitted.

Example of Manufacturing Process in this Embodiment

Next, an example of a process for manufacturing a branch box 80according to this embodiment will be described below. Note that theprocess for manufacturing the branch box 80 is not limited to thefollowing description. Steps that are the same as those in the processfor manufacturing the branch box 80 according to Embodiment 1 will notbe described.

The trunk cable 12 is placed on and fixed to a predetermined position ofthe case 11. The branch cable 13 is placed on and fixed to apredetermined position of the case 11. Solder paste is applied, using aknown method such as screen printing, onto the upper surfaces of thepower trunk lands 45, the signal trunk lands 48, the ground trunk lands49, the power branch lands 51, the signal branch lands 54, and theground branch lands 55.

As shown in FIG. 21, the cover shielding member 93 is mounted, frombelow, on the mounting recess 94 in the wiring portion 91 formed on thelower side of the upper wall of the cover 81, and the cover shieldingmember 93 is screwed to the cover 81 with the screw 29.

As shown in FIG. 22, the first trunk-side bus bar 56, the firstbranch-side bus bar 60, the second trunk-side bus bar 62, the secondbranch-side bus bar 63, and the relay bus bars 64 are mounted on thewiring portion 91 from below, and these bus bars are fixed to the wiringportion 91 using a known method such as gluing or heat welding.

As shown in FIG. 23, the insulating plate 96 is mounted on the wiringportion 91 from below. When the locking reception portions 99 of theinsulating plate 96 are elastically locked to the locking portions 97 ofthe wiring portion 91, the first trunk-side bus bar 56, the firstbranch-side bus bar 60, the second trunk-side bus bar 62, the secondbranch-side bus bar 63, and the relay bus bars 64 are held by the wiringportion 91 and the insulating plate 96.

As shown in FIG. 24, the base shielding member 100 is mounted on theinsulating plate 96 from below, and is fixed thereto using a knownmethod such as gluing or heat welding. At this time, when the cover-sideconnection pieces 95 of the cover shielding member 93 and the base-sideconnection pieces 101 of the base shielding member 100 come into contactwith each other, the cover shielding member 93 and the base shieldingmember 100 are electrically connected to each other.

The two fuses 26 are mounted on the fuse mounting portion 25 provided onthe cover 81 from above. When the leads of the fuses 26 are held by fuseconnection terminal portions 58A, 58B, 58C, and 58D, one of the fuses 26is electrically connected to the first trunk-side bus bar 56 and thefirst branch-side bus bar 60, and the other fuse 26 is electricallyconnected to the second trunk-side bus bar 62 and the second branch-sidebus bar 63.

As shown in FIG. 25, the cover 81 is mounted on the case 11 from above.The case 11 and the cover 81 are assembled into a single body throughelastic engagement between the locking portions 16 provided on the sidewalls of the case 11 and the locking reception portions 17 provided onthe side walls of the cover 81.

A jig (not shown) such as a soldering iron, for example, is insertedinto the cover 81 through the trunk operation hole 82, and then, theoperation for connecting the power trunk lands 45 to the trunk-sideterminal portions 57A and 57B of the first trunk-side bus bar 56 and thesecond trunk-side bus bar 62, the operation for connecting the signaltrunk lands 48 to the trunk-side terminal portions 57C of the relay busbars 64, and the operation for connecting the ground trunk lands 49 tothe trunk-side ground terminal portions 66 of the base shielding member100 are performed (see FIG. 20).

A jig such as a soldering iron, for example, is inserted into the cover81 through the branch operation hole 88, and then, the operation forconnecting the power branch lands 51 to the branch-side terminalportions 61A and 61B of the first branch-side bus bar and the secondbranch-side bus bar 63, the operation for connecting the signal branchlands 54 to the branch-side terminal portions 61C of the relay bus bars64, and the operation for connecting the ground branch lands 55 to thebranch-side ground terminal portions 70 of the base shielding member 100are performed (see FIG. 20).

The trunk operation hole 82 is covered by the trunk subcover 86 byrotating the trunk subcover 86 around the hinge 21 to elastically lockthe subcover locking claws 84 to the subcover locking reception portions85. The branch operation hole 88 is covered by the branch subcover 90 ina similar manner. Accordingly, the branch box 80 according to thisembodiment is complete (see FIG. 18).

Effects of this Embodiment

Next, effects of this embodiment will be described below. According tothis embodiment, the cover 81 includes the trunk operation hole 82,which is open at a position corresponding to the trunk lands and facethe power trunk lands 45 and the signal trunk lands 48, and the branchoperation hole 88, which is open at a position corresponding to thebranch lands and faces the power branch lands 51 and the signal branchlands 54, and the trunk subcover 86 for covering the trunk operationhole 82 and the branch subcover 90 for covering the branch operationhole 88 can be attached to the cover 81.

According to the above-described configuration, by inserting a jigthrough the trunk operation hole 82 in a state in which the cover 81 ismounted on the case 11, it is possible to connect the power trunk lands45 and the trunk-side terminal portions 57A and 57B of the firsttrunk-side bus bar 56 and the second trunk-side bus bar 62, and toconnect the signal trunk lands 48 and the trunk-side terminal portions57C of the relay bus bars 64. Also, it is possible to connect the powerbranch lands 51 and the branch-side terminal portions 61A and 61B of thefirst branch-side bus bar 60 and the second branch-side bus bar 63, andconnect the signal branch lands 54 and the branch-side terminal portions61C of the relay bus bars 64. Then, it is possible to inhibit foreignmatter such as dust from entering the case 11 by covering the trunkoperation hole 82 with the trunk subcover 86 and covering the branchoperation hole 88 with the branch subcover 90. Accordingly, it ispossible to improve workability when the branch box 80 is manufactured.

According to this embodiment, the base shielding member 100 and thecover shielding member 93 are electrically connected to each other.

According to the above-described configuration, it is possible toelectrically connect the ground trunk conductors 32, the ground branchconductors 39, the base shielding member 100, and the cover shieldingmember 93, and thus to reliably shield the relay bus bars 64.

Embodiment 3

Next, Embodiment 3 of technology disclosed in this specification will bedescribed with reference to FIGS. 26 to 29.

As shown in FIG. 27, an insulating plate 110 is made of an insulatingsynthetic resin, and has a substantially rectangular shape when viewedfrom above. The insulating plate 110 includes an insulating plate-sidefirst slit 74 that is bent in an L-shape when viewed from above, and aninsulating plate-side second slit 75 that is located on the left side ofthe insulating plate-side first slit 74 and extends in the front-reardirection when viewed from above.

A first trunk-side bus bar 56, a first branch-side bus bar 60, a secondtrunk-side bus bar 62, a second branch-side bus bar 63, and relay busbars 64 are arranged on the upper side of the insulating plate 110. Theupper side of the insulating plate 110 is provided with multiple linesof ribs 72 that protrude upward. The first trunk-side bus bar 56, thefirst branch-side bus bar 60, the second trunk-side bus bar 62, thesecond branch-side bus bar 63, and the relay bus bars 64 areelectrically insulated from each other due to these ribs 72 beinginterposed between them.

As shown in FIG. 26, a cover shielding member 111 is arranged on theupper side of the insulating plate 110. The cover shielding member 111includes an upper wall, and a first side wall 112 and a second side wall113 that extend downward from side edges of the upper wall. The firstside wall 112 is bent in an L-shape when viewed from above. The firstside wall 112 has a shape corresponding to the above-describedinsulating plate-side first slit 74, and a lower end portion of thefirst side wall 112 is inserted into the insulating plate-side firstslit 74 from above.

The second side wall 113 extends in the front-rear direction when viewedfrom above. The second side wall 113 has a shape corresponding to theabove-described insulating plate-side second slit 75, and a lower endportion of the second side wall 113 is inserted into the insulatingplate-side second slit 75 from above.

As shown in FIG. 27, the lower edges of the first side wall 112 and thesecond side wall 113 of the cover shielding member 111 are provided withcover connection pieces 115 that protrude downward. The cover-sideconnection pieces 115 have a substantially rectangular shape when viewedfrom the side.

The lower side of the insulating plate 110 is provided with a pluralityof legs 73 that protrude downward. Due to these legs 73, the insulatingplate 110 is spaced apart from a bottom wall 11A of the case 11 in astate in which the insulating plate 110 is placed on the bottom wall11A.

A base shielding member 114 is arranged on the lower side of theinsulating plate 110. The base shielding member 114 has an L-shape whenviewed from above. The relay bus bars 64 and the base shielding member114 are arranged overlapping each other vertically when viewed fromabove in a state in which the relay bus bars 64 are attached to thewiring portion 91 of the cover 81, and the base shielding member 114 isattached to the lower side of the insulating plate 110. The outer shapeof the base shielding member 114 is slightly larger than a space inwhich the relay bus bars 64 are arranged. Accordingly, the baseshielding member 114 can inhibit noise from entering the relay bus bars64 from below.

Side edges of the base shielding member 114 are provided with base-sideconnection pieces 116 that extend downward, at positions correspondingto the cover-side connection pieces 115 formed on the cover shieldingmembers 111. The base-side connection pieces 116 have a rectangularshape when viewed from the side. The size of the base-side connectionpieces 116 and the size of the cover-side connection pieces 115 providedon the cover 81 are substantially the same.

As shown in FIGS. 28 and 29, the cover-side connection pieces 115 andthe base-side connection pieces 116 are in contact with each other in astate in which the cover shielding member 111 and the base shieldingmember 114 are mounted on the cover 81. Accordingly, the cover shieldingmember 111 and the base shielding member 114 are electrically connectedto each other.

The insulating plate 110, the first trunk-side bus bar 56, the firstbranch-side bus bar 60, the second trunk-side bus bar 62, the secondbranch-side bus bar 63, and the relay bus bars 64, and the baseshielding member 114 are fixed to each other, using a known method suchas gluing or heat welding.

As shown in FIG. 28, an insulating cover 117 made of an insulatingsynthetic resin is arranged between the relay bus bars 64 and the covershielding member 111. The insulating cover 117 has an L-shape whenviewed from above (see FIG. 27).

As shown in FIG. 26, a front end portion of the insulating cover 117 canbe regarded as a protruding portion 118A that protrudes forward from afront end portion of the cover shielding member 111. Also, a left endportion of the insulating cover 117 can be regarded as a protrudingportion 118B that protrudes to the left from a left end portion of thecover shielding member 111. The width of the protruding portions 118Aand 118B is larger than that of the other portions of the insulatingportion. Legs 119 extend downward from side edges of the protrudingportions 118A and 118B. Because these legs 119 are in contact with theinsulating plate 110 from above, a space in which the relay bus bars 64can be arranged is formed between the insulating cover 117 and theinsulating plate 110.

Because configurations other than the above are substantially the sameas that of Embodiment 1, the same members are given the same referencenumerals, and their redundant description will be omitted.

According to this embodiment, the insulating cover 117 made of aninsulating synthetic resin is interposed between the relay bus bars 64and the cover shielding member 111.

According to the above-described configuration, it is possible toinhibit short circuits between the relay bus bars 64 and the covershielding member 111.

Embodiment 4

Next, Embodiment 4 of technology disclosed in this specification will bedescribed with reference to FIG. 30.

As shown in FIG. 30, in a base shielding member 130 according to thisembodiment, a base-side connection piece 131 includes a base portion 132that protrudes downward, and a pair of elastic contact pieces 133 thatextend laterally from both side edges of the base portion 132. Theelastic contact pieces 133 are folded back toward the base portion 132.The cover-side connection pieces 115 of the cover shielding member 111are inserted from above into the space surrounded by the base portion132 and the pair of folded elastic contact pieces 133.

When outer surfaces of the cover-side connection pieces 115 come intocontact with the pair of elastic contact pieces 133, the cover-sideconnection pieces 115 are pressed against the base portion 132 due tothe elastic force of the elastic contact pieces 133. Accordingly, thecover shielding member 111 and the base shielding member 130 areelectrically connected to each other.

Because configurations other than the above are substantially the sameas that of Embodiment 3, the same members are given the same referencenumerals, and their redundant description will be omitted.

According to the above-described configuration, the cover-sideconnection pieces 115 can reliably come into contact with the base-sideconnection pieces 131 because the cover-side connection pieces 115 arepressed against the base portion 132 due to the elastic force of theelastic contact pieces 133 provided on the base-side connection pieces131. Accordingly, it is possible to improve the reliability ofelectrical connection between the cover shielding member 111 and thebase shielding member 130. As a result, it is possible to improve shieldperformance for the relay bus bars 64.

Embodiment 5

Next, Embodiment 5 of technology disclosed in this specification will bedescribed with reference to FIG. 31.

As shown in FIG. 31, the cover shielding member 140 according to thisembodiment includes one branch-side ground terminal portion 141 thatextends forward from its front end portion and is bent downward in acrank shape. This branch-side ground terminal portion 141 iselectrically connected to ground branch lands 55 of the branch cable 13.

Also, a left end portion of a base shielding member 143 includes onetrunk-side ground terminal portion 142 that extends to the left and isbent downward in a crank shape. This trunk-side ground terminal portion142 is electrically connected to ground trunk lands 49 of the trunkcable 12.

Because configurations other than the above are substantially the sameas that of Embodiment 4, the same members are given the same referencenumerals, and their redundant description will be omitted.

According to this embodiment, the base shielding member 143 is connectedto the ground trunk lands 49, and the cover shielding member 140 isconnected to the ground branch lands 55. Also, the base-side connectionpieces 131 of the base shielding member 143 and the cover-sideconnection pieces 115 of the cover shielding member 140 are electricallyconnected to each other due to the elastic force of the elastic contactpieces 133 formed in the connection pieces 131. Accordingly, it ispossible to further improve shield performance for the base shieldingmember 130 and the cover shielding member 140.

Embodiment 6

Next, Embodiment 6 of technology disclosed in this specification will bedescribed with reference to FIGS. 32 and 33.

As shown in FIG. 32, a first trunk-side bus bar 56, a first branch-sidebus bar 60, a second trunk-side bus bar 62, a second branch-side bus bar63, relay bus bars 64, a cover shielding member 150, and a baseshielding member 151 according to this embodiment are formed as a singlebody through insert molding with an insulating synthetic resin. Themolded synthetic resin can be regarded as an insulating portion 152. Theinsulating portion 152 has a substantially parallelepiped shape that isflat in the up-down direction. The lower side of the insulating portion152 is provided with legs 153 that protrude downward.

As shown in FIG. 33, portions of the first trunk-side bus bar 56 and thesecond trunk-side bus bar 62 that are different from trunk-side terminalportions 57A and 57B and fuse connection terminal portions 58A and 58Bcan be regarded as a first trunk-side embedded portion 154A and a secondtrunk-side embedded portion 154B that are embedded in the insulatingportion 152. Also, portions of the first branch-side bus bar 60 and thesecond branch-side bus bar 63 that are different from branch-sideterminal portions 61A and 61B and fuse connection terminal portions 58Cand 58D can be regarded as a first branch-side embedded portion (notshown) and a second branch-side embedded portion (not shown) that areembedded in the insulating portion 152.

Portions of the relay bus bars 64 that are different from trunk-sideterminal portions 57C and branch-side terminal portions 61C can beregarded as embedded portions 155 embedded in the insulating portion152.

The base shielding member 151 is arranged below the relay bus bars 64with a synthetic resin interposed between them. A front end portion ofthe base shielding member 151 is provided with a branch-side groundterminal portion 70 that is bent downward in a crank shape. A rear endportion of the base shielding member 151 extends slightly rearward frompositions at which the relay bus bars 64 are arranged, and is bentupward at a right angle in the synthetic resin material. The portion ofthe rear end portion of the base shielding member 151 that is bentupward is arranged at a position that is slightly spaced apart from thecover shielding member 150 in the front-rear direction. A portion of thebase shielding member 151 that is different from the branch-side groundterminal portions 70 is embedded in the insulating portion 152.

The cover shielding member 150 is arranged above the relay bus bars 64with a synthetic resin interposed between them. A left end portion ofthe cover shielding member 150 can be regarded as a trunk-side groundterminal portion 66 that is bent downward in a crank shape. A portion ofthe cover shielding member 150 that is different from the trunk-sideground terminal portions 66 is embedded in the synthetic resin.

Because configurations other than the above are substantially the sameas that of Embodiment 1, the same members are given the same referencenumerals, and their redundant description will be omitted.

According to this embodiment, portions of the first trunk-side bus bar56 and the second trunk-side bus bar 62 that are different from thetrunk-side terminal portions 57 and the fuse connection terminalportions 58A and 58B can be regarded as the first trunk-side embeddedportion 154A and the second trunk-side embedded portion 154B that areembedded in the insulating portion 152 made of the synthetic resin.Also, portions of the first branch-side bus bar 60 and the secondbranch-side bus bar 63 that are different from the branch-side terminalportions 61A and 61B and the fuse connection terminal portions 58C and58D can be regarded as a first branch-side embedded portion and a secondbranch-side embedded portion that are embedded in the insulating portion152. Also, portions of the relay bus bars 64 that are different from thetrunk-side terminal portions 57C and the branch-side terminal portions61C can be regarded as the embedded portions 155 embedded in theinsulating portion.

According to the above-described configuration, it is possible toreliably and electrically insulate the first trunk-side bus bar 56, thesecond trunk-side bus bar 62, the first branch-side bus bar 60, thesecond branch-side bus bar 63, and the relay bus bars 64 due to theinsulating synthetic resin.

Other Embodiments

The technology disclosed in this specification is not limited to theembodiments described above with use of the foregoing description anddrawings, and embodiments such as the following are also encompassed inthe technical scope of the technology disclosed in this specification.

(1) A plurality of trunk cables 12 may be arranged in the case 11, or aplurality of branch cables 13 may also be arranged in the case 11.

(2) A signal line may also be provided with a fuse.

(3) A power line may be electromagnetically shielded as a result of thepower line being enclosed by a shielding member.

(4) The case 11 and the cover 15 may also be formed as a single body bya hinge.

(5) The cover 15 may also be a component separate from the trunksubcover 86 and the branch subcover 90. Also, a configuration may beadopted in which the cover 15 is a component separate from the trunksubcover 86 and the branch subcover 90, and the trunk subcover 86 andthe branch subcover 90 are rotatably held by the cover 15 due to a shaftportion being provided on one of them, and a bearing portion beingprovided on the other.

(6) The left holding portion 20A, the right holding portion 20B, and thebranch holding portion 20C may also be omitted.

(7) The number of power conductive paths provided in the trunk cable 12and the number of power conductive paths provided in the branch cable 13may be one, two, four, or more.

(8) The number of signal conductive paths provided in the trunk cable 12and the number of signal conductive paths provided in the branch cable13 may be one, three, or more.

(9) The number of ground conductive paths provided in the trunk cable 12and the number of ground conductive paths provided in the branch cable13 may be one, three, or more.

(10) A configuration may also be adopted in which one trunk cable 12 isconnected to a plurality of branch cables 13.

LIST OF REFERENCE NUMERALS

10, 80 Branch box

11 Case

12 Trunk cable

13 Branch cable

14 Conductive relay path

15, 81 Cover

18A, 18B Positioning pin

19A, 19B Positioning hole

20A Left holding portion

20B Right holding portion

20C Branch holding portion

26 Fuse

27 Cover shielding member

30 Power trunk conductor

31 Signal trunk conductor

32 Ground trunk conductor

34, 41 Insulating film

36, 43 Insulating layer

39 Ground branch conductor

44 Power trunk opening portion

45 Power trunk land

46 Signal trunk opening portion

48 Signal trunk land

50 Power branch opening portion

51 Power branch land

52 Signal branch opening portion

54 Signal branch land

56 First trunk-side bus bar

57A, 57B, 57C Trunk-side terminal portion

60 First branch-side bus bar

61A, 61B, 61C Branch-side terminal portion

62 Second trunk-side bus bar

63 Second branch-side bus bar

64 Relay bus bar

65 Base shielding member

66 Trunk-side ground terminal portion

570 Branch-side ground terminal portion

71, 110 Insulating plate

82 Trunk operation hole

86 Trunk subcover

88 Branch operation hole

90 Branch subcover

117 Insulating cover

154A, 154B, 155 Embedded portion

1. A structure for connecting flexible flat cables, comprising: aflexible flat trunk cable that includes a signal trunk conductor, aground trunk conductor, a trunk shield that is electrically connected tothe ground trunk conductor and encloses the signal trunk conductor toelectromagnetically shield the signal trunk conductor, and an insulatingtrunk coating for covering the signal trunk conductor, the ground trunkconductor, and the trunk shield; a flexible flat branch cable thatincludes a signal branch conductor, a ground branch conductor, a branchshield that is electrically connected to the ground branch conductor andencloses the signal branch conductor to electromagnetically shield thesignal branch conductor, and an insulating branch coating for coveringthe signal branch conductor, the ground branch conductor, and the branchshield; a relay bus bar that includes a trunk-side terminal portionconnected to the signal trunk conductor, and a branch-side terminalportion connected to the signal branch conductor; and a shielding memberfor enclosing the relay bus bar to electromagnetically shield the relaybus bar.
 2. The structure for connecting flexible flat cables accordingto claim 1, wherein the shielding member includes a trunk-side groundterminal portion connected to the ground trunk conductor, and abranch-side ground terminal portion connected to the ground branchconductor.
 3. The structure for connecting flexible flat cablesaccording to claim 2, wherein the shielding member includes a baseshielding member that includes the trunk-side ground terminal portionand the branch-side ground terminal portion, and a cover shieldingmember for enclosing the relay bus bar between the base shielding memberand the cover shielding member.
 4. The structure for connecting flexibleflat cables according to claim 3, wherein the base shielding member andthe cover shielding member are electrically connected to each other. 5.The structure for connecting flexible flat cables according to claim 3,wherein an insulating cover made of an insulating synthetic resin isinterposed between the relay bus bar and the cover shielding member.